Is Trustfulness a Sin？

Is Trustfulness a Sin? is the most devastating question Yozo asks in the notebooks that constitute No Longer Human. It is not a rhetorical flourish but a genuine, repeated appeal to God, born from the wreckage of his marriage to Yoshiko. The question first appears in the immediate aftermath of Yoshiko's violation by a shopkeeper, and it recurs with increasing desperation, marking the point at which Yozo's last hope for a human connection is shattered and his descent into addiction and madness becomes irreversible.

Origin and Context

The question emerges from a specific catastrophe. Yozo had married Yoshiko, a pale seventeen-year-old girl with crooked teeth who worked in a tobacco shop, precisely because she possessed what he called a "genius at trusting people." Her immaculate trustfulness seemed to him "clean and pure, like a waterfall among green leaves"—a rare, almost sacred quality in a world he found terrifying and duplicitous. He had dreamed of taking her on bicycles to see waterfalls framed in summer leaves, a vision of innocent happiness. But one summer night, while Yozo and his friend Masao Horiki were drinking gin on the roof of their apartment, the shopkeeper—a man who had previously commissioned cartoons from Yozo—violated Yoshiko in their own room. Yozo witnessed the scene through a window but did not intervene. The violation was not an act of passion or even of desire; as Yozo later reflected, "one summer night Yoshiko was trusting, and that was all there was to it." It was her very inability to suspect ill intent that made her vulnerable.

The Question Itself

In the pages that follow, Yozo addresses God directly three times with the same question. The first instance comes immediately after the event, as he sits eating beans with Yoshiko, who stands haplessly behind him bearing a platter: "God, I ask you. Is trustfulness a sin?" The second occurs as he watches Yoshiko's trust turn to anxiety and fear, her immaculate faith in others replaced by a permanent, trembling uncertainty: "Is immaculate trustfulness after all a source of sin?" The third comes later, after Yozo has been committed to a mental hospital, where he reflects on his own helplessness and non-resistance: "God, I ask you, is non-resistance a sin?" The three iterations form a sequence: from the specific wound of Yoshiko's violation, to the broader corrosion of trust itself, to Yozo's own passive complicity in his fate.

Consequences and Thematic Weight

The question is not merely a personal lament; it is the novel's most concentrated expression of its central moral paradox. Yozo had always feared human beings, had always expected betrayal and cruelty. Yoshiko's trustfulness was the one thing that made him believe in the possibility of goodness. When that trustfulness led directly to her defilement, Yozo lost his last anchor. He began to drink heavily again, his face coarsened, his teeth fell out, and he turned to copying pornographic pictures for money. The wound he suffered was not jealousy or anger but a metaphysical horror: "It was less the fact of Yoshiko's defilement than the defilement of her trust in people which became so persistent a source of grief as almost to render my life insupportable." The question "Is trustfulness a sin?" thus becomes the hinge on which Yozo's entire worldview turns. If the one pure virtue he had found in the world is itself a source of ruin, then there is no safe ground. The question is never answered, but its repetition—and the events that follow—constitute the novel's bleakest verdict on human relations.